Google ads can be effective but you have to get them completely perfect - I believe they are a rocket science in themselves and have had many a day where I have been so pi55ed off with them I just gave up. Google are EXTREMELY picky about the ad's you have and will pull you up on any teeny weeny little discrepancy!
Make sure you read all the articles and advice on google ads before venturing into them - this is very important.
Regards
Maz